Further to my question about terminating my Norton antivirus . I have 'discovered' that in fact my computer is loaded with W. Defender?

I have W,7 Professional. It's just been scanned by W.Defender (no issues) so have I been paying unnecessarily for Norton - I note that my computer may run slower with both installed?
Update: @ Kswck2 - so do I need a programme AS WELL AS W. Defender? I note what you say about uninstalling Norton - I have 71 days to run on the current contract with them.
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